How often shall halon 1301 cylinders be weighed?

• A. Monthly
• B. Annually
• C. Weekly
• D. Semi-annually

Answer: (D)

Monitoring the actual amount of halon 1301 in the cylinder is done by weighing it, because mass is the most reliable indicator of how much agent remains. Pressure readings can be affected by temperature and other factors, so a scale check directly shows if any leakage has reduced the content. A semi-annual schedule provides a practical balance: it’s frequent enough to catch slow leaks and ensure there’s enough agent to discharge when needed, without the undue burden of more frequent checks. Weighing the cylinder at each service interval helps confirm the cylinder still holds the required amount; waiting longer could allow undetected losses to accumulate, while more frequent checks often aren’t necessary for fixed systems.